CAJ | 학술논문

研究了原料粒度对新型磷酸镁水泥(MPC)水化硬化过程的影响规律.首先,以一定量不同粒度的烧结氧化镁粉(MgO)和磷酸二氢钾(KH_2PO_4)搭配并掺入不同量的缓凝剂硼砂(Na_2B_4O_7·10H_2O)配制MPC.然后,测试MPC浆体3h内半绝热温升曲线、凝结时间和MPC硬化体的强度,并分析硬化体的物相组成和微观结构形貌.结果表明:MgO粉和KH_2PO_4的粒度对MPC水化硬化特性有显著影响,随着MgO粉和KH_2PO_4的颗粒粒径减小,早期水化反应速率加快,凝结时间缩短;但对于抗压强度并非颗粒越小其值越大,在最佳MgO粉和KH_2PO_4粒度范围内,MPC硬化体抗压强度最高.同样,对一定粒度MgO粉和KH_2PO搭配的MPC浆体,在硼砂适量时,MPC硬化体才能具有适宜的凝结时间、水化反应速度和较高的抗压强度.
연구료원료립도대신형린산미수니(MPC)수화경화과정적영향규률.수선,이일정량불동립도적소결양화미분(MgO)화린산이경갑(KH_2PO_4)탑배병참입불동량적완응제붕사(Na_2B_4O_7·10H_2O)배제MPC.연후,측시MPC장체3h내반절열온승곡선、응결시간화MPC경화체적강도,병분석경화체적물상조성화미관결구형모.결과표명:MgO분화KH_2PO_4적립도대MPC수화경화특성유현저영향,수착MgO분화KH_2PO_4적과립립경감소,조기수화반응속솔가쾌,응결시간축단;단대우항압강도병비과립월소기치월대,재최가MgO분화KH_2PO_4립도범위내,MPC경화체항압강도최고.동양,대일정립도MgO분화KH_2PO탑배적MPC장체,재붕사괄량시,MPC경화체재능구유괄의적응결시간、수화반응속도화교고적항압강도.
The effects of the particle size of starting materials on the hydration and hardening process of magnesium-phosphate cement (MPC) are investigated by measuring the temperature rise within 3 h, setting time and compressive strength of MPC pastes. They are composed of certain amount of dead MgO powders and potassium phosphate(KH_2PO_4) with different particle sizes and different borax (Na_2B_4O_7·10H_2O) dosage. The hydration products and micrographs of the hardened MPC pastes are analyzed. The experimental results show that the particle size of dead MgO powers and KH_2PO_4 markedly affect the hydration and hardening process of MPC pastes. With the decrease of particle sizes of MgO powers and KH_2PO_4, the early hydration reaction rate of MPC paste accelerates obviously, and its setting time is shortened; however, the compressive strength of hardened MPC does not increase continuously with the decrease of the particle size of starting materials, and there exists an optimum particle size range of MgO powers and KH_2PO_4. With certain particle size of MgO powders and KH_2PO_4, there is also an optimum B dosage for the hardened MPC paste to have suitable setting time, temperate hydration rate and high compressive strength.